#pragma once
#include <iostream>
#include <string>
#include <vector>
#include <queue>
#include "Log.hpp"
#include "Thread.hpp"
#include "Cond.hpp"
#include "Mutex.hpp"

namespace ThreadPoolModule
{
    using namespace ThreadModule;
    using namespace LogModule;
    using namespace CondModule;
    using namespace MutexModule;

    static const int gnum = 5;

    template <typename T>
    class ThreadPool
    {
        private:
        void WakeUpAllThread()
        {
            LockGuard lockguard(_mutex);
            if(_sleepernum) _cond.Broadcast();
            LOG(LogLevel::INFO)<<"唤醒所有休眠线程";
        }

        void WakeUpOne()
        {
            _cond.Signal();
            LOG(LogLevel::INFO)<<"唤醒一个休眠线程";
        }

    
        ThreadPool(int num = gnum): _num(num),_isrunning(false),_sleepernum(0)
        {
            for (int i = 0; i < num; i++)
            {
                _threads.emplace_back(
                    [this]() 
                    { 
                        HandlerTask(); 
                    });
            }
        }

        void Start()
        {
            if(_isrunning) return;
            _isrunning = true;
            for(auto& thread :_threads)
            {
                thread.Start();
                LOG(LogLevel::INFO)<<"start new thread successfully"<<thread.Name();
            }
        }

        ThreadPool(const ThreadPool<T>&)=delete;
        ThreadPool<T>& operator=(const ThreadPool<T>&)=delete;
        
        public:
        static ThreadPool<T>* GetInstance()
        {
            if(inc==nullptr)
            {
                LockGuard lockguard(_lock);
                LOG(LogLevel::INFO)<<"获取单例...";
                if(inc==nullptr)
                {
                    LOG(LogLevel::INFO)<<"首次使用单例..";
                    inc = new ThreadPool<T>();
                    inc->Start();
                }
            }

            return inc;
        }

        void Stop()
        {
            if(!_isrunning) return ;
            _isrunning = false;
            WakeUpAllThread();
        }

        void Join()
        {
            for(auto& thread :_threads)
            {
                thread.Join();
            }
        }

        void HandlerTask()
        {
            char name [128];
            pthread_getname_np(pthread_self(),name,sizeof(name));
            while(true)
            {
                T t;
                {
                    LockGuard lockguard(_mutex);
                    while(_taskq.empty() && _isrunning)
                    {
                        _sleepernum++;
                        _cond.Wait(_mutex);
                        _sleepernum--;
                    }

                    if(!_isrunning && _taskq.empty())
                    {
                        LOG(LogLevel::INFO)<<name<<"退出了，线程池退出&&任务队列为空";
                        break;
                    }

                    t = _taskq.front();
                    _taskq.pop();
                }
                t();
            }
        }

        bool Enqueue(const T& in)
        {
            if(_isrunning)
            {
                LockGuard lockguard(_mutex);
                _taskq.push(in);
                if(_threads.size()==_sleepernum) WakeUpOne();
                return true;
            }
            return false;
        }
        
        ~ThreadPool()
        {
        }

    private:
        std::vector<Thread> _threads;
        int _num;//线程池里的线程个数
        std::queue<T> _taskq;
        Cond _cond;
        Mutex _mutex;

        bool _isrunning;
        int _sleepernum;

        static ThreadPool<T>*inc;
        static Mutex _lock;
    };

    template <typename T>
    ThreadPool<T>* ThreadPool<T>::inc = nullptr;

    template<typename T>
    Mutex ThreadPool<T>::_lock;
}